Oscillable stand for reproduction cameras



Nov. 23 1926. 1,607,754

w. HOH

OSCILLABLE STAND F OR REPRODUCTION CAMERAS I Filed Jan. 29. 1925 Fig.1 a

Mun. A14,

Patented Nov. 23, 1926.

UNITED STATES PATENT OFFICE.

WALTER HOH, OF LEIPZIG, GERMANY, ASSIGNOR-TO THE FIRM HOE & HAHNE, OF

LEIPZIG, GERMANY.

OSCILLABLE-TAND FOR REPRODUCTION CAMERAS.

. Application filed January 29, 1925, Serial No. 5,589, and in Germany March 19, 1924.

This invention relates to photographic copying apparatus and more particularly to the construction of supports or stands for such apparatus adapted to protect the ap- 5 paratus from the effect of shocks transmitted through the floor of the building.

Shocks transmitted through the floor of the building are liable to cause relative movement between the parts of the photo;

graphic apparatus whilst exposures are be ing made and in order to prevent this it is usual to mount the apparatus on a rigid frame or girder supported by cushioning springs. So far as I am aware in all such 1 known constructions one 01' more pairs of cushioning springs act on the frame or girder at opposite sides of the longitudinal axis thereof and I have found that such constructions are not entirely effective in preventing relative movement between the parts of the photographic apparatus as the members of each pair of springs .yield unequally to vertical shocks and thus induce twisting strains in the. frame or girder.

The object ofthe present invention is to provide an improved construction in which these twisting strains are avoided and according-to the invention this isefi'ected by supporting the frame or girder by springs which act on the frame or girder at points in the same containing the axis of the girder. In order that the single beam carrier be as strong as possible and possess greater resisting capability against twisting it is made of triangular cross section and constructed like a diagonally reinforced lattice girder.

I am aware that it has' been proposed heretofore to provide photographic copying apparatus mounted on a rigid frame or girder supported by three vertically acting cushioning springs, one of which was disposed vertically under the axis of the girder. In this construction however, two of the cushioning springs were disposed at opposite sides of the longitudinal axis. According to the present invention all the supporting springs act on the frame or girder at points in the same vertical plane containing the axis of the girder.

An oscillable stand is shown by way of example on the accompanying drawings which mainly consists of a carrier of triangular cross section supported at the two ends by two feet through the intermediary of one spring at each end. I Fig. 1 is a side elevation, and Fig. 2 a front View of the reproduction apparatus.

Figs. 3 and 4 show modifications of the mounting and lateral guiding of the stand other at the points where it is to be mounted in the feet 9, the two vertical stays at each end being mounted between rollers 2'. These rollers are mounted on lugs which project laterally fromthe feet 9. \Vith the aid of the rollers z' and by means of the vertioal stays h the girder d is guided in the feet in accurately vertical direction. The two carriages k and m for the camera a and the drawing board 6 ride upon the girder and have rollers 11. which run on' tracks on the upper edge of the girder d.

The drawing board may be illuminated by lamps o hanging from a frame w, of

course somewhat at the side of the board so that said lamps do not impede the operation of the camera.

The girder (Z of triangular cross section may also be arranged so that its apex is turned down. In this case the camera and the drawing board could be mounted upon the upper plane surface of the girder in a similar manner as is the case for the commonly used stands of rectangular cross sec tion.

The triangular shape of the cross section of the girder possesses the further advantage that the guides of triangular cross-section such as would otherwise be required for the carriages are not necessary as, when-- these carriages ride upon the girder, they side faces of the girderthan they would 1'11. be guided by guides of triangular cross-sec-' are much better guided upon the inclined tion. The insensibility of the girder against shocks can be increased if, instead of the vertical stays h and rollers 2' springs are.

used as shown in Figs. 3 and 4. As shown in Fig. 3, rods 71 are arranged one at each end of a carrier or girder d. These rods h are telescoped each into a foot g. Between the upper end of each foot and the apex of the girder a spring f is' inserted which surrounds the upper part of rod it so that the carrier or girder d is maintained at this point in its median position with regard to the foot 9 by said spring 7. To the lowerend of rod h springs s are attached which at the other ends are attached to the foot 9 so that they stand at right angles to the vertical rod Ii,

In the form of construction shown in Fig.

4 two supporting springs f are substituted for the one spring 7 and these supporting springs are inserted, between the top plate of the foot y and a two-armed lever 0 which i is pivoted on the vertical rod h by a pivot in 'n. Owing to the use of this two-armed ever 0 the unequal oscillations of the supporting springs f are compensated and the girder (Z is relieved from twisting stress.

I claim 1- l. A support or stand for photographic copying apparatus comprising in combination a carrier consisting of a diagonally rc- -inforced lattice girder of triangular cross girder, vertical springs inserted between said'feet and said girder, a carriage for the camera and a carria e for the drawing board, said carriages riding upon the apex of said irder, and means for securely guid ing saic carriages upon the inclined side walls of said girder.

3. A support or stand for photographic copying apparatus comprising in combination a carrier consisting of a diagonally reinforced lattice girder of triangular cross section, two feet one at each end of said girder, vertical springs. inserted between said feet and said girder, a vertical stay at each end of said girder projecting into the corresponding foot, and horFzontal springs attached with one end to said stay and with the other end to said foot so that they stand at right angles to said stay.

4. A support or stand for photographic copyipg apparatus comprising in combination a carrier consisting of a diagonally reinforced lattice girder of triangular cross section, two feet one at each end of said girder, two vertical guide rods downwardly. projecting one at each end-0t the latticegirder of triangularcross sectionandtele scoped into the corresponding foohja-t'woa' armed lever oscillably mounted'jonea guide rod near the upper end of t1ie;=am1e;-Z.

two vertical springs incerted between ends of said two-armed lever and the top end of said foot and horizontal springs one at each side of the guide rod attached'wi'th' one end to said guide rod and with, tlie o'ther. .end to said foot so that springs stand- :it-

right angles to said guide rod. i H I In testimony whereof I. affix mysignatnf e VVALIER HQH' 

